package com.gency.subscribe.web.configuration.shiro;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.util.CollectionUtils;
import org.springframework.cache.support.SimpleValueWrapper;
import net.sf.ehcache.Ehcache;
/**
 * 
 * 作者:唐鹏
 * 描述: 拓展spring cache
 * 版本: version 1.0.0
 * 时间: 2017年1月19日 上午10:08:39
 */
public class SpringCacheManagerWrapper implements CacheManager {
	 private org.springframework.cache.CacheManager cacheManager;

	    /**
	     * 设置spring cache manager
	     *
	     * @param cacheManager
	     */
	    public void setCacheManager(org.springframework.cache.CacheManager cacheManager) {
	        this.cacheManager = cacheManager;
	    }

	    
	    @SuppressWarnings("unchecked")
		public <K, V> Cache<K, V> getCache(String name) throws CacheException {
	        org.springframework.cache.Cache springCache = cacheManager.getCache(name);
	        return new SpringCacheWrapper(springCache);
	    }

	    static class SpringCacheWrapper implements Cache {
	        private org.springframework.cache.Cache springCache;

	        SpringCacheWrapper(org.springframework.cache.Cache springCache) {
	            this.springCache = springCache;
	        }

	        
	        public Object get(Object key) throws CacheException {
	            Object value = springCache.get(key);
	            if (value instanceof SimpleValueWrapper) {
	                return ((SimpleValueWrapper) value).get();
	            }
	            return value;
	        }

	        
	        public Object put(Object key, Object value) throws CacheException {
	            springCache.put(key, value);
	            return value;
	        }

	        
	        public Object remove(Object key) throws CacheException {
	            springCache.evict(key);
	            return null;
	        }

	        
	        public void clear() throws CacheException {
	            springCache.clear();
	        }

	        
	        public int size() {
	            if(springCache.getNativeCache() instanceof Ehcache) {
	                Ehcache ehcache = (Ehcache) springCache.getNativeCache();
	                return ehcache.getSize();
	            }
	            throw new UnsupportedOperationException("invoke spring cache abstract size method not supported");
	        }

	        
	        public Set keys() {
	            if(springCache.getNativeCache() instanceof Ehcache) {
	                Ehcache ehcache = (Ehcache) springCache.getNativeCache();
	                return new HashSet(ehcache.getKeys());
	            }
	            throw new UnsupportedOperationException("invoke spring cache abstract keys method not supported");
	        }

	        
	        public Collection values() {
	            if(springCache.getNativeCache() instanceof Ehcache) {
	                Ehcache ehcache = (Ehcache) springCache.getNativeCache();
	                List keys = ehcache.getKeys();
	                if (!CollectionUtils.isEmpty(keys)) {
	                    List values = new ArrayList(keys.size());
	                    for (Object key : keys) {
	                        Object value = get(key);
	                        if (value != null) {
	                            values.add(value);
	                        }
	                    }
	                    return Collections.unmodifiableList(values);
	                } else {
	                    return Collections.emptyList();
	                }
	            }
	            throw new UnsupportedOperationException("invoke spring cache abstract values method not supported");
	        }
	    }
}
